They fit comfortably under a helmet

1 inch wide by 3 1/4 long

Stainless Steel Black Oxidized Bird Head Ring

Ideal for light/mild outdoor weather conditions and traveling

Will Not Harm Anything Water Will Not Harm

GFCUPHMG MAGNETIC SS CUP HOLDER Feminine Stainless Steel Rings They fit comfortably under aAttach the Diamond Plate(tm) Magnetic Stainless Steel Cup Holder to anything metal, such as riding mowers, tractors, heavy construction equipment, backyard metal tables, and more. Features heavy duty magnets in base for a secure hold. Handsome exterior mirror finish, insulating foam insert to keep drink cold, and a drainage hole. Measures 3 1 2"" diameter, 4"" height. Gift boxed.